Analog Devices Inc. ADM823TYKS-R7

Overview

ADM823TYKS-R7 from Analog Devices is a precision supervisory circuit with watchdog timer and manual reset, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 3.08 V reset threshold (±50 mV over temperature), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates from VCC = 2.7 V to 3.6 V across −40°C to +125°C. Used in engine control units to ensure safe MCU boot and runtime fault recovery.

For engineers reviewing the ADM823TYKS-R7 datasheet, ADM823TYKS-R7 pinout, ADM823TYKS-R7 application, or ADM823TYKS-R7 equivalent, key selection criteria include reset threshold accuracy at automotive temperature extremes, guaranteed reset validity down to VCC = 1 V, watchdog pulse width tolerance (50 ns min), MR input glitch rejection (100 ns), and SC70 package compatibility with high-density PCB layouts.

Technical Context

The ADM823TYKS-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable trip point across −40°C to +125°C. Its on-chip watchdog timer uses an RC-based oscillator with 1.12–2.40 sec timeout range and resets on any WDI logic transition (min 50 ns pulse width).

It integrates a 52 kΩ internal MR pull-up resistor, debounced manual reset input with 1 µs minimum pulse width, and push-pull RESET output capable of sinking 1.2 mA at VTH min while maintaining valid logic levels down to VCC = 1 V - critical for brownout detection in 3.3 V automotive subsystems.

Key Specifications

Pinout & Package

ADM823TYKS-R7 is housed in a 5-lead SC70 (KS-5) package, 2.0 × 1.25 × 0.9 mm, JEDEC MO-203-AA compliant, optimized for space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with MAX6326T31D2+T and TPS3808G33DBVR, the ADM823TYKS-R7 uniquely combines automotive temperature rating, integrated manual reset with internal pull-up, and watchdog timer in SC70 - enabling compact, robust supervision in safety-critical automotive nodes where both power integrity and software execution monitoring are mandatory.

Availability

ADM823TYKS-R7 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823TYKS-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADM823 family is part of Analog Devices' precision supervisory IC portfolio, engineered specifically for automotive and industrial systems demanding guaranteed reset behavior, watchdog reliability, and extended temperature operation.

FAQ

What is the exact reset threshold voltage of ADM823TYKS-R7 and how does it vary with temperature?

The ADM823TYKS-R7 has a nominal reset threshold of 3.08 V at 25°C, with a guaranteed range of 3.00 V to 3.15 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤ ±12 mV drift over the full automotive temperature range - sufficient to reliably detect 3.3 V rail brownout while avoiding false triggers during thermal cycling.

Does ADM823TYKS-R7 support manual reset, and what are its electrical requirements?

Yes, ADM823TYKS-R7 includes a dedicated MR pin (Pin 3) with active-low logic. It features a 52 kΩ internal pull-up resistor, requires a minimum 1 µs low pulse width, and rejects glitches shorter than 100 ns. The MR input threshold is 0.3 × VCC to 0.7 × VCC, making it compatible with standard 3.3 V GPIOs and mechanical push-buttons without external conditioning.

Can ADM823TYKS-R7 operate reliably when VCC drops below 2.0 V?

Yes, ADM823TYKS-R7 guarantees valid RESET output down to VCC = 1 V - meaning the active-low reset signal remains logically correct (low when asserted, high when deasserted) even during severe brownout conditions. This ensures deterministic MCU behavior during power collapse, unlike many supervisors that lose output control below 1.8 V.

What is the watchdog timeout accuracy of ADM823TYKS-R7, and how is it affected by temperature?

The ADM823TYKS-R7 watchdog timeout is specified as 1.12 sec (min) to 2.40 sec (max), with 1.6 sec typical at 25°C. Figure 11 in the datasheet shows variation of ±0.2 sec over −40°C to +125°C. This stability enables predictable firmware watchdog servicing intervals without requiring temperature compensation in safety-critical automotive software.

Is ADM823TYKS-R7 pin-compatible with other members of the ADM823 family, such as ADM823LYKSZ-R7?

Yes, all ADM823 variants including ADM823TYKS-R7 and ADM823LYKSZ-R7 share identical 5-lead SC70 (KS-5) pinout and package dimensions. They differ only in reset threshold voltage and branding - allowing direct substitution in layout when threshold requirements change, provided system-level timing and voltage margins remain acceptable.